SANA’A, Yemen (CNN) – The leader of a terrorist group said a few words that are relatively unheard of for an organization known for violence; we’re sorry.

That’s what the head of Al Qaeda in the Arabian Peninsula said in a video message on Sunday, apologizing for an attack on a hospital in Yemen.

The attack left dozens of people dead and many others injured.

Qassim Al-Raimi said the attackers were told not to hit the hospital or mosque while targeting the Yemeni Ministry of Defense.

However, one fighter made a mistake.

He said, “We confess to this mistake and fault. We offer our apologies and condolences to the families of the victims. We did not want your lost ones; we did not target them on purpose. This is not of our religion or our morals.”

Raimi also said the group would financially compensate families of victims in the hospital attack.

He also went on to say that Al Qaeda would continue to hit places that have ties to American drones.

While officials say it is not the first time the terror group has apologized, it is rare.